раковина

Formed from ра́ка (ráka, “old-style casket, chest”) (historical, outdated) +‎ -овина (-ovina). At least the secondary meaning cavity, flaw (if not the word itself) is borrowed from Russian ра́ковина (rákovina).

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ра́ковина or ракови́на • (rákovina or rakovína) f

1. shell (exoskeleton of mollusca, typically snails, rapana, mussels)

   Synonym: черу́пка (čerúpka)

2. (material science) blister, cavity, blowhole, flaw (formed during the solidification of a melted material, e.g. metal, concrete)

• ра́кла (rákla, “coffer, chest”)

• “раковина”, in Речник на българския език [Dictionary of the Bulgarian Language] (in Bulgarian), Sofia: Bulgarian Academy of Sciences, 2014
• “раковина”, in Речник на българския език [Dictionary of the Bulgarian Language] (in Bulgarian), Chitanka, 2010

Russian Wikipedia has an article on:

раковина

Wikipedia ^ru

Inherited from Old East Slavic раковина (rakovina, “mother of pearl”). Per Vasmer, from Proto-Slavic *orky (“shell”) (genitive *orkъve) + *-ina, from Proto-Germanic *arkō (“chest, coffer”), from Latin arca (“chest, coffer, coffin”). Cognate with ра́ка (ráka, “shrine of a saint, originally coffin”), from the same Latin source, and with Slovene rákəv (“coffin, crypt”), Czech rakev (“coffin”), rakvice (“shell”), Slovak rakev (“box”), Polabian rakåí (“box”).

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ра́ковина • (rákovina) f inan (genitive ра́ковины, nominative plural ра́ковины, genitive plural ра́ковин, diminutive раку́шка or ра́кушка)

1. shell (hard calcareous external covering of mollusks)
2. (anatomy) pinna, auricle, helix (the external ear)
3. sink, washbowl, basin, bowl
4. vesicle
5. bandstand
6. (metallurgy) blister, cavity, bubble, flaw, blowhole

• раку́шка (rakúška)
• умыва́льник (umyválʹnik)
• каверна (kaverna)

• раковинка (rakovinka)
• ракушечник (rakušečnik)

• → Georgian: რაკოვინა (raḳovina)
• → Uzbek: rakovina